Part had to be one of 3, chatted online with AppliancePartPros.com and they determined it was the Digitron ($180 part). Ordered it immediately, came quickly, called APP for installation instructions, they forwarded PDF Schematic which helped show HOW to remove the cover correctly, etc to access the part. It was a "plug and play" part, took maybe 20 minutes tops and it works beautifully. My idea of success is that it works and there are no leftover screws!
Appliance repair guy wanted $400..BTW, this is a convection oven microwave combo, retail $1,000 so repairing vs replacing it was a no brainer. I am a 70 year old female..going to replace my gas fireplace pilot next...